/Engine/Source/Runtime/SlateCore/Public/Debugging/SlateDebugging.h
Called once the window is drawn (including PaintDeferred). It can be used to draw additional debug info on top of the window.
typedef TMulticastDelegate_FourParams< void, const [FPaintArgs](API\Runtime\SlateCore\Types\FPaintArgs) &, const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) &, [FSlateWindowElementList](API\Runtime\SlateCore\Rendering\FSlateWindowElementList) &, int32 & > FPaintDebugElements